diff --git a/src/system/boot/platform/amiga_m68k/cpu.cpp b/src/system/boot/platform/amiga_m68k/cpu.cpp
index 5432f1d87d..cb5ecea08f 100644
--- a/src/system/boot/platform/amiga_m68k/cpu.cpp
+++ b/src/system/boot/platform/amiga_m68k/cpu.cpp
@@ -105,3 +105,9 @@ cpu_init()
 		// ...or not!
 }
 
+
+extern "C" void
+platform_load_ucode(BootVolume& volume)
+{
+}
+
diff --git a/src/system/boot/platform/atari_m68k/cpu.cpp b/src/system/boot/platform/atari_m68k/cpu.cpp
index 77fb691262..2ea87f560d 100644
--- a/src/system/boot/platform/atari_m68k/cpu.cpp
+++ b/src/system/boot/platform/atari_m68k/cpu.cpp
@@ -130,3 +130,9 @@ cpu_init()
 		// ...or not!
 }
 
+
+extern "C" void
+platform_load_ucode(BootVolume& volume)
+{
+}
+
diff --git a/src/system/boot/platform/openfirmware/Jamfile b/src/system/boot/platform/openfirmware/Jamfile
index abb425943f..3a740de1b8 100644
--- a/src/system/boot/platform/openfirmware/Jamfile
+++ b/src/system/boot/platform/openfirmware/Jamfile
@@ -12,6 +12,7 @@ UsePrivateHeaders [ FDirName graphics common ] ;
 }
 
 local platform_src =
+	cpu.cpp
 	console.cpp
 	debug.cpp
 	devices.cpp
diff --git a/src/system/boot/platform/openfirmware/cpu.cpp b/src/system/boot/platform/openfirmware/cpu.cpp
new file mode 100644
index 0000000000..634303a214
--- /dev/null
+++ b/src/system/boot/platform/openfirmware/cpu.cpp
@@ -0,0 +1,14 @@
+/*
+ * Copyright 2020, Jérôme Duval, jerome.duval@gmail.com. All rights reserved.
+ * Distributed under the terms of the MIT License.
+*/
+
+
+#include <boot/platform.h>
+
+
+extern "C" void
+platform_load_ucode(BootVolume& volume)
+{
+}
+
diff --git a/src/system/boot/platform/u-boot/cpu.cpp b/src/system/boot/platform/u-boot/cpu.cpp
index a4e601e20b..0d00874146 100644
--- a/src/system/boot/platform/u-boot/cpu.cpp
+++ b/src/system/boot/platform/u-boot/cpu.cpp
@@ -36,3 +36,8 @@ cpu_init()
 		panic("You need a 6502 or higher in order to boot!\n");
 }
 
+
+extern "C" void
+platform_load_ucode(BootVolume& volume)
+{
+}